concepts:
  - id: descriptive-statistics
    title: Descriptive Statistics
    description: Core summaries of distributions, central tendency, and spread.
    prerequisites: []
    mastery_signals:
      - explain mean median and variance
      - summarize a simple dataset
    mastery_profile:
      template: foundation_concept

  - id: probability-basics
    title: Probability Basics
    description: Basic event probability and conditional probability.
    prerequisites:
      - descriptive-statistics
    mastery_signals:
      - explain event probability
      - calculate simple conditional probability
    mastery_profile:
      required_dimensions:
        - correctness
        - explanation
        - transfer
      dimension_threshold_overrides:
        transfer: 0.72